while (sb.length() < remainder) {
                sb.append(' ');
            }
            result.add(BOX_CHAR + " " + sb + " " + BOX_CHAR);
        }
        // last line
        sb.setLength(0);
        repeat(sb, BOX_CHAR, size);
        result.add(sb.toString());
        return result;
    }

    private static void repeat(StringBuilder sb, char c, int nb) {
        for (int i = 0; i < nb; i++) {